JP2633644B2 - Puffer type gas circuit breaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to a puffer type gas circuit breaker having a large capacity single-point cut-off contact and a closing resistance such as a 550 KV system. .

(Prior Art) With an increase in capacity of a power transmission system, a breaking capacity of a circuit breaker used in a substation or a switchyard is increasing, and high reliability is required. In order to increase the reliability of the circuit breaker, it is important to reduce the number of parts and simplify the structure. Therefore, the number of breaking points of the circuit breaker is reduced. For example, in the 550KV system, a two-point breaker with a breaking current of 50 KA is currently in practical use, and it is required that the breaker be further cut into one point.

By the way, when such a large-capacity circuit breaker is cut into one point, in order to improve the arc-extinguishing performance, the opening speed of the breaker must be much faster than that of the conventional two-point breaker. There is. Therefore, in contrast to the conventional circuit breaker, which has a fixed electrode and a movable electrode facing the fixed electrode and moves only the movable electrode at the time of opening, the so-called double motion in which two opposed electrodes are simultaneously moved and opened. A called circuit breaker has been proposed. According to the circuit breaker of the double motion system, although the moving speed of each electrode is the same as that of the conventional circuit breaker, there is an advantage that the opening speed is remarkably increased and the arc extinguishing performance is improved.

An example of such a double-motion circuit breaker is shown in FIGS.

In this figure, reference numeral 1 denotes a first movable electrode, and reference numeral 10 denotes a second movable electrode (corresponding to a conventional fixed electrode). The first movable electrode 1 is provided at a tip of a puffer cylinder 2,
An insulating nozzle 3 and a movable energizing contact 4 are concentrically arranged on the outer periphery thereof. An operation rod 5 is fixed to the center of the puffer cylinder 2, and the operation rod 5 is connected to a mechanism (not shown) via an insulating rod 6. A puffer piston 8 fixed to and supported by the insulating cylinder 7 is inserted inside the puffer cylinder 2, and a space surrounded by the puffer piston 8 and the puffer cylinder 2 is a puffer chamber 9.

The second movable electrode 10 is provided so as to protrude at the center of the surface of the energized cylinder 11 facing the first movable electrode 1, and is inserted into the insulating nozzle 3 and the first movable electrode 1. On the outer periphery of the second movable electrode 10, a second movable energizing contact 12 and a second movable shield 13 which are in contact with the movable energizing contact 4 of the first movable electrode are provided. An energizing cylinder 11 supporting the second movable electrode 10 has an energizing conductor 14 at its base.
While being slidably inserted into the first movable electrode 1.
Is connected to a base of an operating rod 5 for driving the first movable electrode 1 via an insulating rod 15 and a link mechanism 16 disposed outside the device. The link mechanism 16 includes first and second connecting rods rotatably connected to both ends of a link 16a.
The link support section 16d supports the links 16b and 16c and the link 16a. The link 16a is rotatably supported by the link support 16d about a fulcrum 16e of the link support 16d set to a predetermined link ratio. Each of the first and second connecting rods 16b and 16c is rotatably connected to the operating rod 5 and the insulating rod 15 at one end thereof. The link support 16d is fixed to an insulating cylinder 9 that is insulated and fixed to a container (not shown).

In the double motion type circuit breaker thus configured, when an operating mechanism (not shown) is driven in the closed state of FIG. 4, the operating rod 5 moves to the operating mechanism side (right side in the figure) at a predetermined speed. Then, the first movable electrode 1 fixed to the distal end moves rightward, and a breaking operation is performed with the second movable electrode 10. On the other hand, with the operation of the operation rod 5, the link mechanism 16 connected thereto is driven to move the insulating rod 15 to the side opposite to the operation rod 5 (left side in the figure). As a result, the current-carrying cylinder 11 and the second movable electrode 10 fixed to the tip of the insulating rod 15 move in the direction opposite to the first movable electrode 1 (left side in the figure). Also, the movement of the operation rod 5 causes the puffer cylinder 2 fixed to the tip thereof to move with respect to the puffer piston 8 fixed to the insulating cylinder 9, and the puffer chamber 9 is compressed. Are separated by being guided by the insulating nozzle 3
It is sprayed between the electrodes, and an arc extinguishing operation is performed.

Note that the closing operation is performed by driving the operation rod 5 in the direction opposite to the blocking operation, so that the first and second movable electrodes 1 and 2 are driven.
Make 10 relatively close.

In this way, in a double-motion circuit breaker,
Since the moving speed of the operating rod 5 is the same as that of the conventional circuit breaker, since both the first and second movable electrodes 1 and 10 are driven, the relative separation speed between the two electrodes is about twice. And even a large capacity circuit breaker can be cut at one point.

(Problems to be Solved by the Invention) Incidentally, in a circuit breaker for a line in a large-capacity system such as a 550 KV class, a closing resistance method is adopted in order to suppress a closing overvoltage at closing. In this method, a closing resistance contact having a closing resistance is provided in parallel with the main contact of the circuit breaker.When closing, the closing resistance contact is closed prior to the main contact, and the closing contact is suppressed in a state where the closing overvoltage is suppressed by the closing resistance. Is input. In this method, at the time of opening, it is necessary that the closing resistance contact is first opened and then the main contact is opened.

When this closing resistance contact is adopted in the above-mentioned double motion type circuit breaker, reduction of the switching overvoltage, downsizing of the circuit breaker and the gas-insulated switchgear employing the same become serious problems, and solving this problem can be solved. This is an important issue.

First, Fig. 6 shows a conventional 550KV class two-point breaker.
The insulation recovery characteristics between the closing contact per point and the arc-extinguishing chamber (main contact) and the insulation recovery characteristics of the closing contact and arc-extinguishing chamber of the 550KV class single-point breaker are shown. As is clear from this figure, 550K
In a V-class single-point breaker, the opening speed of both the main contact and the closing resistance contact is faster than in the case of two single-point breakers.

At the time of opening, the insulation recovery speed of the closing resistance contact is faster than the insulation recovery speed of the main contact.

At the time of closing, the closing resistance contact is closed before the main contact.

It is necessary to satisfy the condition.

However, in a conventional circuit breaker in which only one of the electrodes is movable, the movable electrode and the closing resistance contact are simultaneously moved at the same speed using the same drive source, and the timing of opening or closing of both is determined by the electrode shape. (Whereas the main contact has an electrode structure using a wipe, whereas the closing resistance contact employs a butt contact using a spring). However, in the double motion method used for 550KV class single-point breakers, both electrodes move at the same time at the main contact. When the is moved, the closing or opening speed of the closing resistance contact becomes about 1/2 of the main contact, and the closing or opening speed of the closing resistance contact cannot be made faster than the main contact as described above. Problems arise. In addition, a puffer-type gas circuit breaker that blows an arc-extinguishing gas between the electrodes of the main contact when the electrode is opened is adopted as a large-capacity circuit breaker of this type, whereas a breaker gas is particularly applied to a closing resistance contact. For this reason, it is difficult to make the insulation recovery speed of the closing resistance contact faster than that of the main contact, because no gas is blown.

In the case of a conventional breaker having a closing resistance contact, the arc-extinguishing chamber storing the main contact and the closing resistance contact are housed in the same container, so that the outer diameter of the entire container is increased, and at the same time, it is used. There is also a disadvantage that the entire gas insulated switchgear also becomes large. For example, FIG. 7 is a plan view of a conventional gas insulated switchgear using a circuit breaker of the same container storage type.
Is connected to a circuit breaker 23 with a closing resistance contact via a disconnector 22 and further connected to a bushing 25 on the line side via a current transformer 24, the outer diameter of the vessel of the circuit breaker 23 of each phase. Is large, the dimension L between the phases when the circuit breakers 23 of each phase are arranged becomes large, and the space occupied by the gas insulated switchgear increases, and the length of the three-phase bus 20 which is difficult and expensive to manufacture is increased. There was a disadvantage that the size became large.

Furthermore, a breaker with a closing resistor contact is used for a normal line section, and a circuit breaker without a closing resistor contact is used for the other line sections. Even if a breaker that does not require a closing resistance contact is used, a container large enough to store the closing resistance contact is used in common, so the occupied space and the three-phase collective bus length increase as described above. However, other parts of the gas insulated switchgear also have a problem.

The present invention solves the problems of the prior art as described above,
A highly reliable, large-sized device that contributes to downsizing of the gas insulated switchgear as a whole and also reduces the overvoltage at closing and improves the insulation recovery speed of the closing resistance contact at opening or closing. It is an object of the present invention to provide a puffer type gas circuit breaker with a capacity of one point.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, according to the present invention, a main contact including a first and a second movable electrode is housed in an arc-extinguishing chamber. In parallel with the above, a closing resistance contact portion composed of a fixed side electrode, a moving side electrode and a closing resistor connected to these electrodes is provided, and the first and second movable electrodes in the main contact are simultaneously moved. In a double motion type puffer type gas circuit breaker with a one-point cut-off resistance contact that opens and closes electrodes by opening and closing electrodes, an arc-extinguishing chamber operating rod that drives both movable electrodes of the main contact is moved inside the arc-extinguishing chamber operating cylinder. A closing resistance contact operating rod for driving the movable side electrode is connected to a sliding resistance quenching chamber operating piston, and a closing resistance contact operating rod for driving the movable electrode is connected to a closing resistance contact operating piston slid in the closing operation cylinder. Closing resistance contact A work cylinder and a hydraulic drive for driving synchronously communicates with the hydraulic piping, driving speed of the closing resistor contact operation rod driving speed of the arcing chamber operating rod 2
The area of the both pistons is set to be twice or more.

(Operation) In the present invention having the above configuration, since the opening / closing speed of the closing resistance contact is higher than the relative opening / closing speed of the two movable electrodes of the main contact, even if the arc-extinguishing gas is blown to the closing resistance contact. Even without the function, it is possible to exhibit faster insulation recovery characteristics than the main contact at the time of opening.

In addition, the closing resistor and the closing resistor contact part are housed in a separate container from the main contact, making it possible to reduce the outer diameter of each container. Can be achieved. Further, since a circuit breaker of a small-diameter container containing only the main contact can be used for a line that does not require a resistance input contact, it is possible to contribute to the downsizing of the gas insulated switchgear.

(Embodiment) Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. The same members as those of the conventional circuit shown in FIG. 4 and the following figures are denoted by the same reference numerals, and description thereof is omitted.

In this embodiment, the first movable electrode 1 and the second movable electrode 10
The arc-extinguishing chamber 30 of the main contact having
It is stored in 31. The first movable electrode 1 located in the lower part of the arc-extinguishing chamber 30 is electrically connected to a conductor 33 drawn out from the opening 32 on the lower side surface of the arc-extinguishing chamber housing 31 to the outside (toward the closing resistance contact housing). It is connected. The arc extinguishing chamber 30 is
The insulating cylinder 9 is placed on the operation mechanism box 34 in which the arc-extinguishing chamber storage container 31 is installed.
Supported by The operation rod 5 for driving the movable electrodes 1 and 10 in the arc-extinguishing chamber 30 is extended through an insulating rod 6 into an operation mechanism box 34, and an operation rod of an arc-extinguishing chamber operation cylinder 35 provided therein is provided. Connected to 36. On the other hand, the second movable electrode 10 located above the arc-extinguishing chamber 30
Is connected to a conductor 38 drawn out from an outlet 37 provided at the upper part of the arc-extinguishing chamber housing 31 via the conducting conductor 14.

On the side of the arc-extinguishing chamber storage container 31 as described above, a closing resistance contact storage container 40 which is a separate container is provided.
This storage container 40 has openings provided on the upper and lower sides of the side surface.
The portions 41 and 42 are connected to openings 39 and 32 formed on the side surface of the arc-extinguishing chamber storage container 31. In the closing resistance contact storage container 40, a closing resistance contact portion is stored.
The closing resistance contact portion includes a closing resistor 43, a closing contact fixed-side electrode 44, a spring 45 for returning the closing resistor 43, and a closing contact movable-side electrode 46 facing the closing contact fixed-side electrode 44. The fixed electrode 44 is connected to the conductor 38 to which the second movable electrode 10 of the arc-extinguishing chamber is connected via the closing resistor 43. The movable electrode 46 is electrically connected to a conductor 33 connected to the first movable electrode 1 of the arc-extinguishing chamber through a sliding portion 47. The base of the movable electrode 46 is an insulating rod. It is connected to a closing resistance contact operating cylinder 50 in the operating mechanism box 34 by an operating rod 48 and an operating rod 49.

The closing resistance contact operating cylinder 50 is synchronously driven by being connected to the arc extinguishing chamber operating cylinder 35 by a hydraulic pipe 51, and the driving speed of the operating rod 49 is controlled by the operation of the arc extinguishing chamber operating cylinder 35. The drive speed of the rod 36 is set to be twice or more.

A conductor 38 disposed above each of the storage containers 31 and 40 and connecting the second movable electrode 10 and the fixed-side electrode 44 of the closing resistance contact.
In the present embodiment, the outlet 37 at the top of the arc-extinguishing chamber storage container 31
And a conductor arranged below the storage containers 31 and 40 and connecting the first movable electrode 1 and the movable electrode 46 of the closing resistance contact.
33 is drawn out from the outlet 52 provided in the lower part of the closing resistance contact storage container 40, and is connected to other devices constituting the gas insulated switchgear. In addition, insulating spacers 53 and 54 are provided at the outlets 37 and 52 of these storage containers for supporting the conductors 33 and 38 and separating the gas from other devices.

The operation of the present embodiment having the above configuration will be described.

When the closing command is input in the opening state of FIG. 1, the arc-extinguishing chamber operating cylinder 35 and the closing resistance contact operating cylinder 50 driven in synchronization are driven, and the operating rods 36, 49 move to the closing side. Start. At this time, the operation rod 36 on the arc extinguishing chamber side
The first movable electrode 1 and the second movable electrode 10 of the arc-extinguishing chamber 30
Is driven in the opposite direction by the link mechanism 16 as described in the above-mentioned prior art, so that the relative throwing speed of the two is about twice as high as the driving speed of the operating rod 36. On the other hand, in order to suppress the overvoltage at the time of closing, the closing resistance contact side needs to be closed earlier than the closing of the high-speed arc extinguishing chamber 30 as described above. The resistance contact operating cylinder 50 moves the operating rod 49 to the arc-extinguishing chamber 30.
Are driven at a speed higher than the relative speed of the first and second movable electrodes 1 and 10, the closing resistance contact is always closed before the main contact of the arc-extinguishing chamber. as a result,
First, the movable-side electrode 46 of the closing resistance contact comes into contact with the fixed-side electrode 44, and this is pushed against the return spring 45 to connect the conductors 33 and 38 via the closing resistor 43, and thereafter The main contact on the arc-extinguishing chamber 30 side, which is slower than the closing speed of the closing resistance contact, is closed as described in the related art, and the conductors 33 and 38 are electrically connected.

On the other hand, when the electrode is opened, the operating cylinders 35 and 50 are driven in the opposite direction to the closing time. In this case, too, the movable electrode 46 of the closing resistance contact is connected to the first and second movable electrodes of the arc-extinguishing chamber 30. Since the separation is performed at a speed higher than the relative separation speeds of 1 and 10, the insulation recovery characteristics as shown in FIG. 6 of the prior art can be sufficiently satisfied. That is, since the closing resistance contact is a butt contact, the movable electrode 46 is separated from the fixed electrode 44 when the operation rod 48 is driven in a direction in which the operation rod 48 is separated.
At this time, since the return speed of the return spring 45 of the fixed-side electrode 44 is slower than the separation speed of the movable-side electrode 46, both electrodes can be immediately separated. On the other hand, the first on the arc extinguishing chamber side,
Since the second movable electrodes 1 and 10 have a wipe structure, they do not immediately separate even after the operation rod 36 starts opening, and a fixed timing is applied from the closing resistance contact side immediately opened as described above. Can be opened.

In the present embodiment having the above configuration and operation, the following effects are exhibited.

Since the opening speed of the closing resistance contact is higher than the relative opening speed of the main contact, the insulation recovery characteristics of the closing resistance contact surely exceed the warpage of the main contact, improving the reliability of equipment. I do.

Since the arc-extinguishing chamber storage container 31 and the storage container 40 for the closing resistance contact are provided separately, the outer diameter of the container can be reduced. As a result, as shown in FIGS. 2 and 3, when the puffer-type gas circuit breaker of this embodiment is incorporated in a gas-insulated switchgear, the interphase size can be reduced, and the bus length can be reduced. The size of the gas insulated switchgear can be reduced.

Since the closing resistance contact storage container is separate from the arc-extinguishing room storage container, only the circuit breaker having the main contact housed in the arc-extinguishing room storage container should be used in places that do not require a closing resistance contact other than the track line. Since it is sufficient to dispose them, it is possible to reduce the size of the gas insulated switchgear while sharing the container.

A closing resistor is disposed on the upper portion of the closing resistor contact storage container 40, and the operating rod 49 of the movable electrode 46 of the closing resistor contact is provided.
Is directly connected to the operation cylinder 50, so that the structure is simple and highly reliable.

Hydraulic operation cylinders 50 and 35 are used as drive sources of the closing resistance contact and main contact, respectively, and both are connected by hydraulic piping 51, so control of both operation cylinders is easy and each contact is driven at different speed. It is very easy to open and close the door at an accurate timing.

If the operation mechanism system for each contact is provided separately, even if one system is defective, only the normal contact will open and close, and as a result, the breaker may be destroyed, but due to the hydraulic piping, By interlocking the two operation cylinders, it is possible to solve the problem that only one contact is opened and closed.

The present invention is not limited to the above embodiment, but can be widely applied to the entire breaker of the double-motion type in which the main contacts are opened and closed. Further, the present invention is also applicable to a circuit breaker in which a main contact and a closing resistance contact are accommodated in the same storage container.

[Effects of the Invention] As described above, according to the present invention, the driving speed of the closing resistance contact operating rod is set to be twice or more the driving speed of the arc-extinguishing chamber operating rod. , And the insulation recovery characteristic of the closing resistance contact surely exceeds that of the main contact, thereby improving the reliability of the device.

In addition, since the piston is hydraulically driven and the piston has a predetermined area, the circuit breaker container can be configured without increasing the size. Then, the closing resistance contact operating cylinder for driving the closing resistance contact and the main contact and the arc-extinguishing chamber operating cylinder are hydraulically driven, and the two are communicated with a hydraulic pipe so that they are synchronized.
Control of both operation cylinders is facilitated, it is extremely easy to drive each contact at a different speed, and it is possible to open and close at precise timing. Further, by connecting the two operation cylinders with each other by the hydraulic piping, it is possible to solve the problem that only one contact is opened and closed.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a puffer type gas circuit breaker according to the present invention, FIG. 2 is a plan view showing a state in which the puffer type gas circuit breaker shown in FIG. 4 and 5 are cross-sectional views showing an example of a conventional double-motion type puffer-type gas circuit breaker. FIG. 4 shows a closed state and FIG. 5 shows an opened state. FIG.
FIG. 7 is a characteristic diagram showing the insulation recovery characteristics of the main contact and the closing resistance contact of the 550KV class single-break circuit breaker and double-break circuit breaker. FIG. 7 shows a problem of the gas insulated switchgear using the conventional puffer type gas circuit breaker. FIG. 1 First movable electrode, 10 Second movable electrode, 20 Three-phase collective bus, 21 Connection bus, 22 Disconnector, 23 Circuit breaker, 24 Current transformer, 25 …… Bushing, 30 …… Arc extinguishing chamber,
31 ... arc-extinguishing chamber storage container, 32 ... opening, 33 ... conductor, 34
…………………………………………………………………………………………………………………….
Opening part, 40: closing resistance contact storage container, 43: closing resistance body, 44: closing resistance fixed side electrode, 45: return spring, 46 ... closing resistance contact movable side electrode, 47: sliding Department, 48
…… Insulated rod, 49 …… Operation rod, 50 …… Closing resistance contact operation cylinder, 51 …… Hydraulic piping, 52 …… Outlet.

Claims (1)

(57) [Claims] A main contact comprising a first and a second movable electrode is housed in an arc-extinguishing chamber, and a fixed-side electrode, a movable-side electrode, and a closing resistor connected to these electrodes in parallel with the main contact. A double-motion type single-point cut-off resistance contactor contactor provided with a closing resistance contact portion, the opening and closing electrodes being provided by simultaneously moving the first and second movable electrodes of the main contact. In the gas circuit breaker, an arc-extinguishing chamber operating rod that drives both movable electrodes of the main contact is connected to an arc-extinguishing chamber operating piston that slides in an arc-extinguishing chamber operating cylinder, and a closing resistance that drives the movable-side electrode. The contact operation rod is connected to a closing resistance contact operation piston that slides in the closing operation cylinder, and the arc extinguishing chamber operation cylinder and the closing resistance contact operation cylinder communicate with each other via a hydraulic pipe, and are hydraulically driven to synchronize and drive. , A puffer type gas circuit breaker, wherein the area of both pistons is set such that the driving speed of the closing resistance contact operating rod is twice or more as high as the driving speed of the arc extinguishing chamber operating rod.